CVE-2025-13446: Tenda AC21 Firmware

Critical severity, CVSS 9.8. EPSS: 3.9% chance of exploitation in the next 30 days.

A vulnerability has been found in Tenda AC21 16.03.08.16. This vulnerability affects unknown code of the file /goform/SetSysTimeCfg. The manipulation of the argument timeZone/time leads to stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used.

Affected products

• Tenda AC21 Firmware: version 16.03.08.16 only

Published 2025-11-20. Last modified 2026-06-17.